90=13(6-u)

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Solution for 90=13(6-u) equation: 



90=13(6-u)

We move all terms to the left:

90-(13(6-u))=0

We add all the numbers together, and all the variables

-(13(-1u+6))+90=0



We calculate terms in parentheses: -(13(-1u+6)), so:

13(-1u+6)

We multiply parentheses

-13u+78

Back to the equation:

-(-13u+78)



We get rid of parentheses

13u-78+90=0

We add all the numbers together, and all the variables

13u+12=0

We move all terms containing u to the left, all other terms to the right

13u=-12

u=-12/13

u=-12/13

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